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Estimation of egg populations of the clover root curculio sitona hispidula coleoptera curculionidae in kentucky usa alfalfa and red clover fields



Estimation of egg populations of the clover root curculio sitona hispidula coleoptera curculionidae in kentucky usa alfalfa and red clover fields



Canadian Entomologist 109(9): 1257-1264



Sampling techniques for estimating egg populations of the clover root curculio S. hispidula (F.) were developed in alfalfa [Medicago sativa] and red clover [Trifolium pratense] fields in Kentucky [USA]. An appropriate sample unit was a 3 .times. 3 in. (7.6 .times. 7.6 cm) area of plants and the soil beneath it to a depth of 4-5 in. (10.2-12.7 cm). This was processed by a flotation technique. The spatial disposition of the eggs conformed to a clumped pattern in both fields. The variation of 88-93% in log variances was accounted for by the variation in log means. There were no significant differences in dispersion pattern between the 2 crops. Variance analysis revealed that block and plot differences were rarely significant but the interquadrat variance predominated. The number of samples required to estimate the population with specified level of significance and margin of error was inversely proportional to population density.

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Accession: 005387298

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Related references

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